I had to return to a property recently, because our post-radon test showed radon levels in their basement apartment to be about .7 above EPA safe limits, although upstairs levels tested safe. The apartment is next to the large crawlspace, and I was to attempt to dig under the basement concrete slab horizontally, from the crawlspace.
Unfortunately, I could find no gravel layer from the outside, so I have to return again tomorrow, to attempt to drill directly through the concrete floor from inside the apartment to find that gravel layer. If we find that there is no gravel layer, the only alternative will be to install a heat recovery ventilator.
Unfortunately, I could find no gravel layer from the outside, so I have to return again tomorrow, to attempt to drill directly through the concrete floor from inside the apartment to find that gravel layer. If we find that there is no gravel layer, the only alternative will be to install a heat recovery ventilator.
Digging below the foundation
Nothing but concrete - on dirt
Current vacuum levels
Sealing loose sections with sand raised vacuum levels a bit....
Our original opening was sealed back up
Some loose tile helps seal the edges
Sand is also good for sealing loose edges of the vapor-barrier
Sand seals around the base of the A/C unit
A pillar is a leaky spot until we pour sand around it.
Placed a trim ring around the pipe exit
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